Weft bobbin for looms



g- 12, 1969 1..'r. CHERESHNEV ET AL 3,460,587

WEFI BOBBIN FOR LOOMS Filed Sept. 11, 1967 United States Patent M 3,460,587 WEFT BO'EBIN FOR LOOMS Leonid Trofimovich, Chereshnev, ulitsa Suschevskaya 29,

kv. 26, Moscow, and Viktor Dmitrievich Khokhlov,

ulitsa Koltensaya 10, kv. 53, Khimki, Moskovskoi oblasti, U.S.S.R.

Filed Sept. 11, 1967, Ser. No. 666,867 Int. Cl. B65h 75/02; D033 5/08; D0311 45/00 US. Cl. 139289 1 Claim ABSTRACT OF THE DISCLOSURE A bobbin for use with an electric weft feeler for a loom in which a portion of the surface of the bobbin adapted to be contacted by the electric feeler upon depletion of the weft on the bobbin has applied thereto a current-conducting coating of a synthetic resin with the resin containing carbon as a current-conducting component.

The present invention relates to weft bobbins and, more particularly, to weft bobbins for looms.

Weft bobbins are known which have a metal currentconducting coating on their surface coming in contact with the loom feeler.

Such bobbins present the following disadvantages: the metal coating is very costly and requires a great quantity of metal; the weight of the bobbin is considerably in creased; the metal coating forms a boss on the bobbin surface so that the weft breakage becomes more frequent; and the metal coating is hard, causing the weft to be torn by the feeler needles.

An object of the present invention is to provide a weft bobbin with a current-conducting coating that is inexpensive to manufacture.

Another object of the present invention is to provide a Weft bobbin with a current-conducting coating which does not increase the weight of the bobbin.

Still another object of the present invention is to provide a weft bobbin with a current-conducting coating which does not increase weft breakage.

These and other objects, and advantages of the invention are achieved by providing a weft bobbin with a current-conducting coating on its surface coming in contact with the loom feeler, said coating being made of a current-conducting synthetic resin containing a powdered substance on a carbon base as the current-conducting component.

It is advisable to use acetylene black or graphite as the conducting component.

In addition to the current-conducting component the resin contains: a solvent, i.e., ethyl alcohol, a catalyst, i.e., aniline, an adhesive on the base of an alcohol solution of a phenolformaldehyde-polyvinyl-butyral resin; and a polymerizer, i.e., a 75% alcohol solution of a resol phenolformaldehyde resin.

A better understanding of the invention will be obtained from the following description of an embodiment thereof with reference to the accompanying drawing, wherein the weft bobbin of the invention is represented.

3,460,587 Patented Aug. 12, 1969 The surface a of a bobbin body 1 adapted to be contacted by the electric feeler of a loom (not shown upon depletion of the weft yarn on the bobbin body) is cleaned of varnish and ground coating that has applied to the bobbin during its manufacture. The surface a is then cleaned of dust and coated by means of an air brush with a layer of previously prepared current-conducting resin with a viscosity of 47-50 sec. (according to B3-1 the nozzle diameter is 5.6 mm.) at room temperature (20-25 C). During the application of the coating the bobbin is rotated at a uniform speed. The current-conducting resin contains a current-conducting component such as acetylene black or graphite, ethyl alcohol as a solvent, aniline as a catalyst, an adhesive on the base of an alcohol solution of phenol-formaldehyde-polyvinyl-butyral resin, and a polymerizer, i.e., a alcohol solution of resol phenolformaldehyde resin. Coating the bobbin with the currentconducting resin cuts down manufacturing costs, obviates thickening of the bobbin surface and facilitates operation. The bobbin is dried for 20-30 min. at a temperature of 20-25 C. Then, proceeding as in the first case, a second layer of current-comlucting resin is applied to the bobbin surface, and the bobbin is again dried.

The bobbin coated with the layer of current-conducting resin is then placed for 2 hours in the furnace for resin polymerization at a temperature of 115-125 C., after which it is cooled outside the furnace to room temperature of 20-25 C.

When testing the finished bobbin, the coating of current-conducting resin allows the passage of a current up to 40 ma.

The electrical resistance of the layer with a 4-5 mm. gap between the electrodes is within the range of 200-300 ohms.

The above described bobbin is provided with an inexpensive coating that is easy to produce and is much more elastic than a metal coating and more reliable in operation.

What is claimed is:

1. A bobbin for use with an electric weft feeler for a m including a body having a portion thereof adapted to be contacted by the feeler upon depletion of the weft yarn on the bobbin body, a current-conducting coating of synthetic resin applied to said portion, the resin containing carbon as a current-conducting component, the resin also containing ethyl alcohol as a solvent, aniline as a catalyst, an adhesive on the base of an alcohol solution of phenolformaldehyde-polyvinyl-butyral resin and a 75 alcohol solution of resol phenol-formaldehyde resin as the polymerizing agent.

References Cited UNITED STATES PATENTS HENRY S. JAUDON, Primary Examiner US. Cl. X.R. 242-118 

